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 #include &lt;QtGui&gt;

 #include &quot;chatdialog.h&quot;

 ChatDialog::ChatDialog(QWidget *parent)
     : QDialog(parent)
 {
     setupUi(this);

     lineEdit-&gt;setFocusPolicy(Qt::StrongFocus);
     textEdit-&gt;setFocusPolicy(Qt::NoFocus);
     textEdit-&gt;setReadOnly(true);
     listWidget-&gt;setFocusPolicy(Qt::NoFocus);

     connect(lineEdit, SIGNAL(returnPressed()), this, SLOT(returnPressed()));
     connect(&amp;client, SIGNAL(newMessage(const QString &amp;, const QString &amp;)),
             this, SLOT(appendMessage(const QString &amp;, const QString &amp;)));
     connect(&amp;client, SIGNAL(newParticipant(const QString &amp;)),
             this, SLOT(newParticipant(const QString &amp;)));
     connect(&amp;client, SIGNAL(participantLeft(const QString &amp;)),
             this, SLOT(participantLeft(const QString &amp;)));

     myNickName = client.nickName();
     newParticipant(myNickName);
     tableFormat.setBorder(0);
     QTimer::singleShot(10 * 1000, this, SLOT(showInformation()));
 }

 void ChatDialog::appendMessage(const QString &amp;from, const QString &amp;message)
 {
     if (from.isEmpty() || message.isEmpty())
         return;

     QTextCursor cursor(textEdit-&gt;textCursor());
     cursor.movePosition(QTextCursor::End);
     QTextTable *table = cursor.insertTable(1, 2, tableFormat);
     table-&gt;cellAt(0, 0).firstCursorPosition().insertText(&quot;&lt;&quot; + from + &quot;&gt; &quot;);
     table-&gt;cellAt(0, 1).firstCursorPosition().insertText(message);
     QScrollBar *bar = textEdit-&gt;verticalScrollBar();
     bar-&gt;setValue(bar-&gt;maximum());
 }

 void ChatDialog::returnPressed()
 {
     QString text = lineEdit-&gt;text();
     if (text.isEmpty())
         return;

     if (text.startsWith(QChar('/'))) {
         QColor color = textEdit-&gt;textColor();
         textEdit-&gt;setTextColor(Qt::red);
         textEdit-&gt;append(tr(&quot;! Unknown command: %1&quot;)
                          .arg(text.left(text.indexOf(' '))));
         textEdit-&gt;setTextColor(color);
     } else {
         client.sendMessage(text);
         appendMessage(myNickName, text);
     }

     lineEdit-&gt;clear();
 }

 void ChatDialog::newParticipant(const QString &amp;nick)
 {
     if (nick.isEmpty())
         return;

     QColor color = textEdit-&gt;textColor();
     textEdit-&gt;setTextColor(Qt::gray);
     textEdit-&gt;append(tr(&quot;* %1 has joined&quot;).arg(nick));
     textEdit-&gt;setTextColor(color);
     listWidget-&gt;addItem(nick);
 }

 void ChatDialog::participantLeft(const QString &amp;nick)
 {
     if (nick.isEmpty())
         return;

     QList&lt;QListWidgetItem *&gt; items = listWidget-&gt;findItems(nick,
                                                            Qt::MatchExactly);
     if (items.isEmpty())
         return;

     delete items.at(0);
     QColor color = textEdit-&gt;textColor();
     textEdit-&gt;setTextColor(Qt::gray);
     textEdit-&gt;append(tr(&quot;* %1 has left&quot;).arg(nick));
     textEdit-&gt;setTextColor(color);
 }

 void ChatDialog::showInformation()
 {
     if (listWidget-&gt;count() == 1) {
         QMessageBox::information(this, tr(&quot;Chat&quot;),
                                  tr(&quot;Launch several instances of this &quot;
                                     &quot;program on your local network and &quot;
                                     &quot;start chatting!&quot;));
     }
 }</pre>
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